[GHC] #15207: bad dwarf frame in stgRun.c when compiled with with gcc on mac and assembled by as/gcc/clang (aka apple clang assembler)

[GHC]

#15207: bad dwarf frame in stgRun.c when compiled with with gcc on mac and
assembled by as/gcc/clang (aka apple clang assembler)
-------------------------------------+-------------------------------------
        Reporter:  carter            |                Owner:  (none)
            Type:  bug               |               Status:  infoneeded
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Runtime System    |              Version:  8.4.3
      Resolution:                    |             Keywords:
Operating System:  MacOS X           |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D4781
       Wiki Page:                    |
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Comment (by bgamari):

 Sigh; this is all just very unfortunate. It seems that there is something
 funny about Apple's clang (surprise surprise!) The patch as-merged breaks
 under standard Clang, which apparently inserts the necessary CFI
 directives into inline assembler, just as GCC does. I'm going to revert
 until we have a better understanding of what is going on here.

 Carter, can you look into precisely when this happens? Specifically which
 Clang version are you seeing break? Which Clang versions work?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15207#comment:19>
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